Type-writing machine.



E. E. STRONG.

TYPE WRITING MAGHINB.

APPLICATION FILED MAB..1'1, 1909.

Patented June 8, 1909.

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INVENTOR} I q I ATTORNEY E. E. STRONG.

TYPE WRITING MACHINE. APPLICATION FILED MAR. 17, 1909.

Patehted Jime 8,1909.

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To all whom it may (finder-11,5.

ELIIEHA E. STRONG, OF PARIS, FRANCE, ASSIGNOR TO UNDERWOOD' PANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

- TYPE-waterline MACHINE.

Be a known that I, 11mm E. s im, a

, citizen ofthe United States of America, re-

aiding in Paris, France, have invented certain new and useful Im rovements in Type- Writin Machines, of w ich the following is a spec cation. r

This invention relates to mechanismwhereby the power-driven carria e of a typewriting machine maybe space backwardly by means of a key at the keyboard. v

The object of the invention is to provide a simple, easily operated device that may readily applied to existing machines, forbe back-spacing thecarriage and preventing overthrow thereof. H In carrying out the invention, a back-spacing pawl is pivoted upon the end of a lever adjacent to the usual .eseapementrack, and

a key is connected to said lever to move it, 1 pawl into engagement with and throw the the rack, to back-space the carriage. -At the same time, thekey moves a dog into engagement with a notched Wheel which is provided upon the usual carriage-driving spring-barrel, and prevents excessive backward movement or overthrow of the carriage.

In the accompanying drawings, Figure 1 is a diagrammatic rear elevation of a fragment of a back-spacing device, to illustrate" the first step in the operation .of the backspacing pawl. Fig. 2 is .a rear elevation showing the back-spacing devices in normal positions. lfilg. 3 1s a view similar to Fig. 2, but showing the carriage as having been spaced backwardly. Fig. 4 is a sectional side elevation of the back-spacing devices and carriage; showing the parts in normal positions. Fig. 5 shows the. backspacing devices in efi'ective positions.

In the'well known Underwood typewriting machine, to which my invention is shown applied, the usual carriage 1, runnin upon a rail 2, supports a platen 3, and as an cscapement rack 4; The carriage is pro-- pelled by a spring barrel 5, which is connected to the carriage b'y means of a strap 6. The rack meshes w1th a inion 7, the latter connected byback-chec pa'wls8 to an escapement wheel 9, the latter controlledv by dogs 10. The pawls 8 permit the carusage to be run backwardly independently of the escapernent wheel 9.

. According to the present invention, a-key specificatioinof'l'letters Patent. Application filed-Hatch .17," 1909. Serial No. 483,978.

Patented June 8, 1909.

. 11 is provided at the keyboard of the machlne upon the forward end of a lever 12,

which work 14, and between its ends is connected by a link 15 to a lever 16. The latter, which is pivoted upon'ar suitable support 17, is con nected by a ink- 18 to an arm 19 of an elbow lever, which is pivoted at 20 upon the framework, and also comprises an upstanding arm 21, to thetop of which is pivoted at 22 a back-spacing pawl 23, adjacent to the rack, but normally clear of the same, as at Fig. 2.

Upon depressing the key 11, the lever 12 is carried down together with the link 15,-

and-the lever 16 is rocked to lift the link 18 and thereby swing arm 19 up from the Fig. 2 to the Fig. 3 position. The point of the pawl 23 swings to the left about the pivot 20," at Fig. 2, and first carries the pawl into engagement with a rack tooth, as seen at Fig. 1,. where the normal position of the pawl is indicated in dotted lines. The final portion of the movement of the lever 19, 21, causes the pawl to drive the rack back a letter-space' from the Fig. 1 position to the Fig. 3 position, so that the clicks 8 catch upon the succeeding teeth of the pinion 7. The backwardmovement imparted to the rack 5 is sufficient to compensate also for the back lash of the escapement wheel 9 from. the Fig. 2 to the Fig. 3 position; so that depression of the key 11 insures that the carriage shall be set back and come to rest one letter space back of its original position.

The rear endof the lever 16 engagesv and lifts an arm 24 pivoted'at 25 upon the framework, and having a dog 26 which is lifted into engagement with a notched or toothed wheel 27 secured or formed upon the springbarrel 5. This dog prevents accidental movement ofthe spring barrel; and since the latter is connected to the carriage by means of the strap 6, it will be seen that the dog 26 renders it impossible for the carriage ,to overthrow or to have an excessive movement at the back-spacing operation.- Upon relieving the key 11 from pressure the same is returned to normal position by, a spring 28, which is connected to the key lever 12 and to the arm 24, and the elbow lever 21, 19 returns to normal position toether with theke A sprin 29 holds the geek-spacing paw 23 norma y against a stop 30 provided upon the arm 21, but yields is fulcrumed at 13 upon the frame TYPEWRITER OOM- v curring du ing the back lash of the springthe dog 26 swingsdown idly tothe Fig. 4

. throw of the carriage at the back-spacing sition.

barrel to prevent overthrow of the carnage to permit the pawl to ride over the rack teeth during'the return of 21 to normal povices, of a spring barrel connected to said carriage to drive the same, a key having means operating on said esc'a ement devices to space the-carria e backwar ly, and means operated by said ey to operate upon sai spring barrel to prevent overthrow of the carriage at the back-spacing operation.

4. In a typewriting machine, the combination with a carriage having escapement devices, and a spring barrel connected to the carriage, of a pawl operated by a key to en- The 5 ring 28 is connected to the arm 2e to with w the dog 26 from the.notched wheel 27.; this withdrawal of the dog ocbarrel v5 as the escapement wheel 9 turns from the Fig. 3' to. Fi 2 position. This takes, place a the initia portion of the return movement of the key, and thereafter osition. I gage said escapement devices to back-space Having thus described my invention, I the carriage,a toothed or notched wheelupon claim: 1 said spring arrel, and a do I operated by said key to engage said whee at the backspacing operation to prevent overthrow of the carriage.

"5. In a typewriting machine, the combination with a carriage having an escapement rack anda spring barrel connected to the carria e, of a lever pivoted upon the machine rame and carrying at one end a paw 1. In a typewriting machine, thecombination with a power-driven carriagehavin'g an escapement rack, of a lever pivoted upon the machine frame and carrying at one end a pawl adjacent to said rack, a lever bearin a key, a third lever between said levers an connected to both of them, and a device engaged by said third lever to prevent overadjacent to said rack, a key connected to said lever to move the pawl into engagement with the rack and set the carriage backward, a toothed or notched wheel upon said spring barrel, and a dog operated by said key to engagesaid whee at the back-spacing operation to prevent overthrow of the carriage.

' ELISIIA E. STRONG.

operation. p

2.' In a typewri ing machine, the combination with a carriage having escapement de-' vices, and a spring barrel connected to said carriage, 0 .means to operate upon the escapement devices, to back-space the carriage, and means to bear upon said spring Witnesses:

LOUIS S. Fnmns,

at the back-spa ing operation.

ELL-wool) AUSTIN WELDEN.

- 3. In a typewriting machine, the combination with a carriage'having escapement de- 

